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Compensating method for active power filter inverter harmonic domain dead zone effect

A power filter, dead zone effect technology, applied in active power filter, DC circuit can reduce harmonics/ripple, harmonic reduction device and other directions, can solve the problem of output current waveform distortion and reduce harmonic components , Improve filtering performance, eliminate negative effects

Inactive Publication Date: 2007-01-31
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem that the existence of the dead time causes the output current waveform to be distorted, the present invention provides a compensation method for the dead time effect in the harmonic domain of the active power filter active power filter inverter

Method used

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  • Compensating method for active power filter inverter harmonic domain dead zone effect
  • Compensating method for active power filter inverter harmonic domain dead zone effect
  • Compensating method for active power filter inverter harmonic domain dead zone effect

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Embodiment Construction

[0014] see figure 1 , figure 1 It is the schematic diagram of inverter PWM modulation. Use the improved regular sampling method for PWM modulation, set the period of the triangular wave as T, sample the modulation signal at two adjacent negative peak times ti and ti+T of the triangular wave to obtain point C and point D, and make a constant flow through point C and point D The line and triangular waves intersect at point A and point B respectively, and control the on-off of the power switching device at the time t1 of point A and the time t2 of point B. The sampling time ti of each period, the period T and the amplitude K of the triangular wave are all determined, and the values ​​of the modulation signal at points C and D are respectively S1 and S2, then the equation of the line segment CD is

[0015] (t-ti) / (s-s1)=T / (s2-s1) (1)

[0016] The equations of the two waists of the triangle wave are

[0017] (t-ti) / (s+k)=T / 4k (2)

[0018] (t-ti-T) / (s+k)=-T / 4k (3)

[0019] Res...

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Abstract

The invention discloses an active power filter inverter harmonic domain dead zone effect compensating method, comprising the steps of: detecting harmonic current in compensated object, adopting improved regular sampling method to make PWM modulation, and obtaining pulse width data of PWM control signal; detecting inverter inputted harmonic current, advancing ON time of power switch tube corresponding to the inverter by a dead zone time according to the inverter outputted harmonic current for making corresponding compensation. And it can obtain desired output pulse signal at the output end, effectively reducing main harmonic components in the output harmonic current, and thus making amplitude and phase of the output harmonic current more approach to desired condition.

Description

technical field [0001] The patent of the invention relates to a compensation method for the dead zone effect in the harmonic domain of an active power filter inverter. Background technique [0002] With the development of modern industry, the power load is becoming more and more complex, forming the characteristics of large capacity and time-varying harmonics in the power system. Traditional LC passive filters are increasingly unable to meet the requirements of modern industrial applications and power systems. With the emergence of active power filters (APF), it provides an important way for grid harmonic control. The active power filter counteracts the harmonic current generated by the load by injecting a certain compensation current into the grid. Its application overcomes some shortcomings of traditional harmonic suppression methods such as LC filters. It can not only compensate for the high It can automatically adapt to the rapid changes of grid impedance and frequency,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14H02M1/12H02J1/02H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 罗安姚瞬周柯李欣然唐杰范瑞祥吴宁
Owner HUNAN UNIV